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SN32F100 Series
32-Bit Cortex-M0 Micro-Controller
SONiX TECHNOLOGY CO., LTD
Page 51
Version 1.9
13:12
PLLCLKSEL[1:0]
System PLL clock source
00: IHRC 12 MHz oscillator
01: EHS X’TAL 10
MHz ~ 25 MHz
Other: Reserved
R/W
0
11:9
Reserved
R
0
8
FSEL
Front divider value. The division value F is the programmed 2
FSEL
0: F = 1
1: F = 2
R/W
0
7:5
PSEL[2:0]
Post divider value. P= PSEL[2:0]*2
000~010: Reserved
011: P = 6
100: P = 8
101: P = 10
110: P = 12
111: P = 14
R/W
011b
4:0
MSEL[4:0]
Feedback divider value.
M: 3~31
R/W
0x3
To select the appropriate values for M, P, and F, it is recommended to follow these constraints:
1.
10MHz ≤ F
CLKIN
≤ 25MHz
2.
150MHz ≤ F
VCO
≤ 330MHz
3.
2 < M ≤31
4. F = 1, or 2
5. P = 6, 8, 10, 12, or 14
(duty 50% +/- 2.5%)
6. F
CLKOUT
= 20MHz, 30MHz, 40MHz, 50MHz, 24MHz, 36MHz, 48MHz, 32MHz, 22MHz, 24MHz, 50MHz
with jitter < ±500 ps
Fclkout
Fclkin
V
V
V
V
V
V
V
V
V
V
V
V
44MHz
48MHz
16MHz
22MHz
16MHz
12MHz
12MHz
20MHz
30MHz
40MHz
22MHz
24MHz
25MHz
10MHz
10MHz
50MHz
24MHz
25MHz
32MHz
36MHz
3.3.2.1
RECOMMEND FREQUENCY SETTING
F
VCO
= F
CLKIN
/ F * M
F
CLKOUT
= F
VCO
/ P
F
CLKIN
(MHz)
FSEL
F=2
FEL
MSEL[4:0]=M
F
VCO
(MHz)
=F
CLKIN
/F*M
PSEL[2:0]
P= PSEL[2:0]*2
F
CLKOUT
(MHz)
10
0
1
20
200
5
10
20
10
0
1
22
220
5
10
22
10
0
1
18
180
3
6
30
10
0
1
24
240
3
6
40
10
0
1
30
300
3
6
50
12
0
1
16
192
4
8
24
12
0
1
18
216
3
6
36
12
0
1
24
288
3
6
48
16
0
1
16
256
4
8
32
16
0
1
18
288
3
6
48
20
1
2
30
300
3
6
50
22
0
1
12
264
3
6
44
24
0
1
12
288
3
6
48
25
0
1
12
300
3
6
50
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